JP2013143835A - Fixture of cable and fixture structure of cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixture of a cable which securely supports the cable and prevents local bending etc. against meandering (swinging) occurring in a horizontal direction, a vertical direction, etc. of the cable with a simple structure, and to provide a fixture structure of the cable.SOLUTION: A support member 7 is fixed near a tip part of an arm part 5. The support member 7 is composed of a cylindrical shaft part 20 and a spherical part 19 formed at an end part of the shaft part 20. The shaft part 20 serves as a male screw part, penetrates through the arm part 5, and is fixed to the arm part 5 with a nut 9 from the upper side. A grip member 11 is formed by joining a pair of grip members 11a, 11b so that the grip members 11a, 11b face each other. Hemispherical recessed parts, each of which has an outer diameter that is slightly larger than an outer diameter of the spherical part 19, are respectively provided on facing surfaces of the grip members 11a, 11b so as to substantially correspond to an outer shape of the spherical part 19. In other words, when the grip members 11a, 11b are joined with each other, a substantially spherical space (a spherical part grip part 21), corresponding to the spherical part 19, is formed.

Description

  The present invention relates to a cable fixture such as a leaky coaxial cable supported and fixed to a wall surface, an electric pole, and the like, and a cable fixing structure.

  2. Description of the Related Art Conventionally, a leaky coaxial cable (hereinafter referred to as LCX (Leaky Coaxial Cable)) is installed along a track on the side of a track such as a railroad for the purpose of the radio of the railroad. As such LCX support / fixation method, for example, there is a single messenger method.

  FIG. 8 is a diagram showing a cable fixing structure according to a conventional single messenger system. The cable 30 such as LCX has a substantially snowman-like cross-sectional shape in which a support wire portion and a conductive wire portion are externally connected. The support wire portion is for resisting the tension or the like of the conducting wire portion.

  The cable 30 is supported by a cable fixture 31. The cable fixture 31 is fixed at a predetermined interval to a fixing portion 37 such as a wall surface on the side of the track. The cable fixture 31 includes gripping members 33a and 33b, bolts 35, and the like. On the mutually facing surfaces of the gripping members 33a and 33b, a concave groove is formed corresponding to the outer shape of the cable 30 and continuous along the cable laying direction. Therefore, the cable 30 is sandwiched by the gripping members 33a and 33b (the support wire portion of the cable 30 is gripped), and the cable 30 is supported and fixed.

  Such conventional cable fixtures 31 are installed on the wall surface of the track or the like at intervals of 5 to 6 m. That is, the cable 30 is fixed to the fixing portion 37 by the cable fixing tool 31 every 5 to 6 m.

  However, in a cable laid on the side of a track of a train such as a Shinkansen, the cable is subjected to a very large wind pressure when the train passes. For this reason, when the train passes, the cable 30 greatly oscillates and swings with respect to the track (relative to the laying state). On the other hand, the cable 30 is securely fixed by the cable fixture 31. Therefore, the cable 30 greatly meanders at a free portion between the cable fixtures 31, and the cable 30 is subjected to extremely large bending stress or the like in the vicinity of the boundary with the fixing portion by the cable fixture 31. For this reason, there exists a possibility that the cable 30 may be damaged.

  On the other hand, there is a double messenger system instead of a single messenger system. In the double messenger system, a messenger wire is laid over the entire length of the track and the cable is supported by the messenger wire. However, in the double messenger method, it is necessary to lay the messenger wire over the entire length of the track, so that it takes time and cost.

  For example, the LCX can be prevented from being locally bent and the cable can be reliably supported by, for example, a flexible elastic material that can be bent with respect to the fixture. There is a cable support that is provided with an elastic plate portion, and that allows the elastic plate portion to swing with respect to the fixture (Patent Document 1).

JP 2005-130543 A

  However, in the method as disclosed in Patent Document 1, the elastic plate material is formed of a resin material or the like, and is repeatedly deformed over a long period of time in an environment such as rain or ultraviolet rays. Therefore, deterioration of the elastic plate material becomes a problem. In addition, the direction in which the cable is sandwiched by the elastic plate member is a deformation in the surface direction of the elastic plate member, so that the deformation is relatively easy, but the direction perpendicular to the surface of the elastic plate member (for example, support) The direction of rotating up and down with respect to the cable laying direction with the tool as the center cannot sufficiently follow the meandering of the cable. For this reason, it is difficult to follow the meandering in the vertical direction.

  The present invention has been made in view of such problems, and can support a cable reliably with a simple structure, and can be locally applied to meandering (swaying) in the horizontal direction and vertical direction of the cable. It is an object of the present invention to provide a cable fixing device and a cable fixing structure that can prevent bending and the like.

  In order to achieve the above-described object, the first invention is a cable fixture, comprising: an arm portion fixed to an installation target portion; a support member provided near an end of the arm portion; and the support member. A gripping member to be attached, and a spherical portion having a substantially spherical shape is formed at an end of the support member. The gripping member grips a cable and a spherical portion gripping portion that grips the spherical portion. The cable fixture includes a cable gripping portion, the spherical portion gripping portion is swingable with respect to the spherical portion, and the cable gripping portion is capable of gripping a cable.

  The support member includes a shaft portion connected to the arm portion and the spherical portion provided at a tip of the shaft portion, and the spherical portion gripping portion corresponds to the spherical portion having an opening portion on one side. It is a spherical recess, and the opening is preferably larger than the diameter of the shaft portion and smaller than the outer diameter of the spherical portion.

  The gripping member is preferably swingable at an angle of 15 ° or more with respect to the support member.

  According to the first invention, since the cable is gripped by the gripping member that grips the spherical portion at the tip of the support member, the spherical portion rotates (slids) inside the spherical portion gripping portion in the gripping portion that grips the cable. The cable can swing (rotate) with respect to the fixed portion. For this reason, it is possible to reliably support the cable without using a special material, and to allow the cable to swing. In particular, since it swings with respect to the spherical portion, it can swing in all directions as well. For this reason, it is possible to prevent local bending of the cable.

  In addition, since the size of the opening provided in the spherical portion gripping portion is large with respect to the axis of the support member and small with respect to the spherical portion, the spherical portion can be reliably gripped and the size of the opening portion is optimized. Thus, the holding member can be allowed to swing at an angle of 15 ° or more with respect to the support member. Therefore, it is possible to sufficiently follow the swing range of the cable laid on the side of the Shinkansen track.

  A second invention is a cable fixing structure, and includes an arm portion provided in a substantially horizontal direction, a support member provided in the vicinity of an end portion of the arm portion, and a gripping member attached to the support member. The support member is formed with a spherical portion having a substantially spherical shape, and the gripping member uses a cable fixture having a spherical portion gripping portion for gripping the spherical portion and a cable gripping portion for gripping the cable. The cable fixtures are installed at predetermined intervals in the cable laying direction, the cable is gripped by the cable gripping portion, and the spherical portion gripping portion swings with respect to the spherical portion while gripping the spherical portion. The cable fixing structure is characterized by allowing the cable to sway by moving.

  The cable may be a self-supporting leaky coaxial cable in which a support line portion and a conductor portion are joined and integrated, and the cable gripping portion may hold the support line portion.

  According to the second invention, since the cable is securely supported and the fixture allows the cable to swing in all directions with respect to the cable fixture, local bending or the like occurs in the cable. There is no.

  According to the present invention, the cable can be securely supported with a simple structure, and the cable can be fixed to prevent local bending or the like with respect to meandering (swing) in the horizontal direction and vertical direction of the cable. Tools and cable fixing structures can be provided.

It is a figure which shows the cable fixing structure 1, (a) is a general view, (b) is an enlarged view of the cable fixing tool 3 vicinity. It is a figure which shows the cable fixing tool 3, (a) is the sectional view on the AA line of FIG.1 (b), (b) is the sectional view on the BB line of FIG.1 (b). FIG. 3 is an exploded perspective view of the cable fixture 3. FIG. 3 is an assembled perspective view of the cable fixture 3. The figure which shows the rocking | fluctuation state of the cable 2 seen from the cable axial direction. The figure which shows the rocking | fluctuation state of the cable 2 seen from the cable front. The figure which shows the rocking | fluctuation state of the cable 2 seen from the cable upper direction. The figure which shows the conventional cable fixing tool 31. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1A and 1B are diagrams showing a cable fixing structure 1, FIG. 1A is an overall view, and FIG. 1B is an enlarged view of the vicinity of a cable fixture 3. 2 is a diagram showing the cable fixture 3. FIG. 2 (a) is a cross-sectional view taken along line AA in FIG. 1 (b), and FIG. 2 (b) is a cross-sectional view taken along line BB in FIG. 1 (b). It is line sectional drawing. FIG. 3 is an exploded perspective view of the cable fixture 3, and FIG. 4 is an assembled perspective view of the cable fixture 3.

  As shown in FIG. 1A, in the cable fixing structure 1, the cable 2 is supported and fixed by a plurality of cable fixing tools 3. The cable 2 is, for example, a self-supporting LCX, and a supporting wire portion and a conducting wire portion are connected by a sheath, and has a substantially snowman-like cross-sectional shape.

  As shown in FIG. 1A and FIG. 2, a plurality of cable fixtures 3 are installed at predetermined intervals along the track along the track. The cable fixture 3 is fixed to the wall portion 17 beside the track, for example, every 5 to 6 m. Note that the cable fixture 3 may not be directly fixed to the wall portion 17, and may be fixed to another fixing bracket fixed to the wall portion 17, a column body, or the like.

  The arm portion 5 is fixed to the wall portion 17 with a bolt or the like. The arm portion 5 protrudes in a substantially horizontal direction substantially perpendicular to the wall portion 17. As such a configuration, for example, a substantially L-shaped member can be used, and one straight portion of the L-shaped member is fixed to the wall portion 17 and the other straight portion is used as the arm portion 5. it can.

  A support member 7 is fixed in the vicinity of the distal end portion of the arm portion 5. As shown in FIGS. 2B and 3, the support member 7 includes a cylindrical shaft portion 20 and a spherical portion 19 formed at the end of the shaft portion 20. A part of the shaft portion 20 becomes a male screw portion, passes through the arm portion 5, and is fixed to the arm portion 5 by a nut 9 from above. The spherical portion 19 has a substantially spherical shape, and a shaft portion 20 is provided in part.

  As shown in FIG. 3, the gripping member 11 is formed by joining a pair of gripping members 11a and 11b facing each other. A hemispherical concave portion having an outer diameter slightly larger than the outer diameter of the spherical portion 19 is formed on the opposing surfaces of the gripping members 11 a and 11 b so as to substantially correspond to the outer shape of the spherical portion 19. That is, when the gripping members 11a and 11b are joined (the joined members are referred to as the gripping member 11), a substantially spherical space (spherical part gripping part 21) corresponding to the spherical part 19 is formed.

  An opening 25 is formed in the upper part of the spherical part gripping part 21. That is, semicircular cutouts communicating with the spherical portion gripping portion 21 are formed on the upper portions of the gripping members 11a and 11b, respectively. Therefore, when the gripping members 11 a and 11 b are joined, a circular opening 25 that connects the spherical portion gripping portion 21 and the outside is formed in the upper portion of the spherical portion gripping portion 21.

  The inner diameter of the opening 25 in the grip member 11 is sufficiently larger than the outer diameter of the shaft portion 20 of the support member 7. Therefore, in a state where the spherical portion 19 is sandwiched by the spherical portion gripping portion 21 of the gripping member 11, the shaft portion 20 projects from the opening portion 25 to the upper portion of the gripping member 11, and between the shaft portion 20 and the inner surface of the opening portion 25. A clearance is formed. Further, the inner diameter of the opening 25 is smaller than the outer diameter of the spherical portion 19. Therefore, the spherical portion 19 does not come out of the opening 25 in a state where the spherical portion 19 is sandwiched by the spherical portion gripping portion 21 of the gripping member 11.

  A step is formed below the spherical portion gripping portion 21 of the gripping members 11a and 11b, and a gap is formed on the mating surfaces in a state of facing each other. Bolt holes 27, which are through holes, are formed in portions corresponding to the gaps. As shown in FIGS. 3 and 4, the bolt 13 is inserted into the bolt hole 27 and is fixed by the nut 15 on the other side. A groove-like recess that is continuous in the width direction is formed in the lower part of the gripping members 11a and 11b. The concave portion has a shape corresponding to the outer shape of the support line portion of the cable 2, and the cable gripping portion 23 is formed by combining the respective concave portions.

  As shown in FIG. 2, the cable gripping part 23 is a part that grips the support line part of the cable 2. In other words, the cable 2 is securely held and fixed to the holding member 11 by the cable holding portion 23. At this time, since the bolt 13 is fixed at the gap forming portion on the facing surface described above, the cable 2 can be reliably gripped.

  Each member constituting the cable fixture does not need to be a special material, and a general metal material such as steel, stainless steel, or aluminum can be used.

  Next, the use state of the cable fixture 3 will be described. FIG. 5 is a cross-sectional view of the cable 2 as viewed from the axial direction. As described above, the arm portion 5 is provided in a substantially horizontal direction, and the support member 7 is fixed substantially vertically (vertical direction) to the arm portion 5. The spherical portion 19 at the lower end of the support member 7 is gripped by the spherical portion gripping portion 21 of the gripping member 11.

  At this time, since the spherical portion gripping portion 21 is slightly larger than the spherical portion 19, the outer surface of the spherical portion 19 and the inner surface of the spherical portion gripping portion 21 slide, and the gripping member 11 rotates around the spherical portion 19. It can be moved. That is, as shown in FIG. 5, the gripping member 11 rotates about the cable axis direction (direction perpendicular to the paper surface) at the approximate center of the spherical portion 19 as the rotation axis.

  Here, the size of the opening 25 is sufficiently larger than the shaft 20. Therefore, when the gripping member 11 rotates with respect to the support member 7, the range until the inner surface of the opening 25 comes into contact with the shaft portion 20 is the rotation allowable range (swing allowable range) of the gripping member 11. Become. In FIG. 5, when the vertical direction is used as a reference, the gripping member 11 can rotate (swing) by an angle C from the vertical direction with the above-described direction as a rotation axis.

  Here, the inventors attach an accelerometer to the conventional fixing method as shown in FIG. 8 for the cable provided along the Shinkansen, and measure the acceleration of the fixture due to the wind pressure when passing through the Shinkansen. did. Further, when the displacement amount is calculated from the acceleration and applied to the movement amount of the cable in the present invention so that the displacement amount can be obtained, the rotation at an angle of 13.71 ° with respect to the above-described rotation axis is approximately, It was confirmed that it corresponds to the displacement amount in the above-mentioned fixing bracket. In other words, if it can be rotated by an angle of 13.71 ° or more, even if it is used as a cable fixing bracket along the Shinkansen, the cable can be allowed to meander (oscillate) when passing through the Shinkansen, and the cable can be bent locally. Can be prevented.

  More preferably, the cable can be more reliably handled with meandering (swinging) by setting the cable pivotable angle (swingable angle) to 15 ° or more. That is, in FIG. 5, the rotation angle C with the cable laying direction as the rotation axis is preferably 15 ° or more.

  FIG. 6 is a view showing a state of the cable fixture 3 as seen from the front. As shown in FIG. 6, the cable fixture 3 can be rotated (oscillated) using a horizontal direction (direction perpendicular to the paper surface) perpendicular to the cable laying direction at the approximate center of the spherical portion 19 as a rotation axis. is there. In FIG. 6, when the vertical direction is used as a reference, the gripping member 11 can be rotated by an angle D from the vertical direction with the above-described direction as a rotation axis.

  Also in FIG. 6, it is desirable that the rotation angle D about the horizontal direction perpendicular to the cable laying direction at the approximate center of the spherical portion 19 is 15 ° or more.

  FIG. 7 is a view showing a state of the cable fixture 3 as seen from above. As shown in FIG. 7, the cable fixture 3 can also rotate (swing) about a vertical direction (direction perpendicular to the paper surface) perpendicular to the cable laying direction at the approximate center of the spherical portion 19. . In FIG. 7, when the cable laying direction is used as a reference, the gripping member 11 can be rotated by an angle E from the cable laying direction with the above-described direction as a rotation axis.

  In FIG. 7 also, it is desirable that the rotation angle E about the vertical direction perpendicular to the cable laying direction at the approximate center of the spherical portion 19 is 15 ° or more.

  In addition, as a shape for achieving the above configuration, for example, the outer diameter of the spherical portion 19 is 20 mmφ, the outer diameter of the shaft portion 20 is 10 mmφ, the inner diameter of the spherical portion gripping portion 21 is 21 mmφ, and the opening 25 The inner diameter may be 17.2 mmφ (about 4 mm thick).

  As described above, according to the cable fixing structure 1 of the present embodiment, the cable 2 can be reliably supported with a simple structure, and the cable fixing tool 3 follows the meandering (swing) of the cable 2. Is possible. Therefore, local bending or the like does not occur in the cable 2.

  Further, when the cable 2 is laid in a substantially horizontal direction, the cable 2 is swung in the cable laying direction, the horizontal direction perpendicular to the cable laying direction, and the vertical direction with respect to the spherical portion 19. It can be rotated (swinged) about three directions perpendicular to each other. For this reason, the wind pressure applied to the cable 2 can follow any direction of the cable meandering, and can be allowed to swing.

  Further, if a swing allowable range of 15 ° or more in each direction can be secured as the swinging range of the gripping member 11 (cable 2), for example, with respect to meandering (swinging) of the cable due to wind pressure when passing through the Shinkansen along the Shinkansen Even if it follows, it can follow reliably and generation | occurrence | production of the local bending to the cable 2 can be prevented.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, the shape of the cable 2 is not limited to the illustrated example, and may be other shapes as long as it can be gripped by the gripping member 11. Further, the holding structure of the cable 2 by the holding member 11 is not limited to the illustrated example. As long as the cable 2 can be securely gripped, the shape of the cable gripping portion 23 of the gripping member 11 may be any shape.

DESCRIPTION OF SYMBOLS 1 ......... Cable fixing structure 2 ......... Cable 3 ......... Cable fixture 5 ......... Arm part 7 ......... Support member 9 ......... Nut 11 ...... Grip member 13 ......... Bolt 15 ... ... Nut 17 ......... Wall 19 ......... Spherical 20 ...... Shaft 21 ...... Spherical gripping part 23 ......... Cable gripping part 25 ......... Opening part 27 ......... Bolt hole 30 ... ... Cable 31 ......... Cable fixtures 33a, 33b ......... Holding member 35 ......... Bolt 37 ......... Fixed portion

Claims (5)

A cable fixture,
An arm part fixed to the installation target part;
A support member provided near the end of the arm,
A gripping member attached to the support member;
Comprising
A spherical portion having a substantially spherical shape is formed at the end of the support member,
The gripping member has a spherical part gripping part for gripping the spherical part and a cable gripping part for gripping a cable,
The spherical part gripping part is swingable with respect to the spherical part,
The cable holding part is capable of holding a cable, and is a cable fixing tool. The support member includes a shaft portion connected to the arm portion, and the spherical portion provided at a tip of the shaft portion,
The spherical portion gripping portion is a spherical concave portion corresponding to the spherical portion having an opening on one side,
The cable fixture according to claim 1, wherein the opening is larger than a diameter of the shaft portion and smaller than an outer diameter of the spherical portion.   The cable holding tool according to claim 1 or 2, wherein the gripping member is swingable at an angle of 15 ° or more with respect to the support member. Cable fixing structure,
An arm portion provided in a substantially horizontal direction; a support member provided in the vicinity of an end portion of the arm portion; and a gripping member attached to the support member. A substantially spherical spherical shape is provided at a lower end of the support member. A cable fixture having a spherical part gripping part for gripping the spherical part and a cable gripping part for gripping a cable,
The cable fixture is installed at predetermined intervals in the cable laying direction,
The cable is gripped by the cable gripping portion;
The cable fixing structure characterized by allowing the cable to swing when the spherical part gripping part swings with respect to the spherical part while gripping the spherical part.   The cable is a self-supporting leaky coaxial cable in which a support wire portion and a conductive wire portion are joined and integrated, and the cable gripping portion holds the support wire portion. 4. The cable fixing structure according to 4.

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